i blame bane and his rule of 2
Well, yeah that was the point of them going silent rather than loud.
By the Sith officially not existing, they could hunt down and destroy Jedi Holocrons containing knowledge useful to the Jedi, weakening the Jedi, while hoarding any knowledge that could be useful to the Sith, strengthening the Sith.
The Rule of Two was made with the purpose of making stronger and stronger Sith. After a thousand years of this, with the first and thus weakest of these Sith being the already powerful Bane, we get Sidious. It makes sense for Sidious to thus be the most powerful Sith. As for Anakin, the dude's the friggin Chosen One. Of course he's the most powerful Force user that could ever exist. He made the Son and the Daughter both submit.
That's... Utter bull. Sorry, but it's true. We know that Sidious killed his master before learning everything from him. That's canon. We know that a lot of Sith before them did the exact same thing.
And having a millienia of hoarded knowledge does not make them inherently "stronger" than those who came before him.
And the Anakin part? Just because he made the Son and Daughter Submit does not inherently mean he was stronger than them. In fact, it's highly likely that he's not.
One being being inherently stronger than two aspects of the force? It's far more likely that being the chosen one affected his very nature, making those two bow to him as they did their father when he attempted to force the issue. The three of them were equals, the father still made them bow.
Being Chosen to bring Balance to the Force does not necessarily mean most powerful guy ever. It just means that he is capable of bringing Balance.
That could mean He is the most powerful, but it could also mean he is merely strong enough. Or his very nature somehow makes him different. Or he has some inborn trait, that makes him capable of forcing the issue.
Brute force is not always the solution, and in Prophecies, Brute force is borderline never the solution.